inode.c revision c4e3d3f374b409500e3dd05c0b0eca6ac98a6b4e
1/* 2 * inode.c --- utility routines to read and write inodes 3 * 4 * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Public 8 * License. 9 * %End-Header% 10 */ 11 12#include <stdio.h> 13#include <string.h> 14#if HAVE_UNISTD_H 15#include <unistd.h> 16#endif 17#if HAVE_SYS_STAT_H 18#include <sys/stat.h> 19#endif 20#if HAVE_SYS_TYPES_H 21#include <sys/types.h> 22#endif 23 24#include "ext2_fs.h" 25#include "ext2fsP.h" 26#include "e2image.h" 27 28struct ext2_struct_inode_scan { 29 errcode_t magic; 30 ext2_filsys fs; 31 ext2_ino_t current_inode; 32 blk_t current_block; 33 dgrp_t current_group; 34 ext2_ino_t inodes_left; 35 blk_t blocks_left; 36 dgrp_t groups_left; 37 blk_t inode_buffer_blocks; 38 char * inode_buffer; 39 int inode_size; 40 char * ptr; 41 int bytes_left; 42 char *temp_buffer; 43 errcode_t (*done_group)(ext2_filsys fs, 44 ext2_inode_scan scan, 45 dgrp_t group, 46 void * priv_data); 47 void * done_group_data; 48 int bad_block_ptr; 49 int scan_flags; 50 int reserved[6]; 51}; 52 53/* 54 * This routine flushes the icache, if it exists. 55 */ 56errcode_t ext2fs_flush_icache(ext2_filsys fs) 57{ 58 int i; 59 60 if (!fs->icache) 61 return 0; 62 63 for (i=0; i < fs->icache->cache_size; i++) 64 fs->icache->cache[i].ino = 0; 65 66 return 0; 67} 68 69static errcode_t create_icache(ext2_filsys fs) 70{ 71 errcode_t retval; 72 73 if (fs->icache) 74 return 0; 75 retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache), &fs->icache); 76 if (retval) 77 return retval; 78 79 memset(fs->icache, 0, sizeof(struct ext2_inode_cache)); 80 retval = ext2fs_get_mem(fs->blocksize, &fs->icache->buffer); 81 if (retval) { 82 ext2fs_free_mem(&fs->icache); 83 return retval; 84 } 85 fs->icache->buffer_blk = 0; 86 fs->icache->cache_last = -1; 87 fs->icache->cache_size = 4; 88 fs->icache->refcount = 1; 89 retval = ext2fs_get_mem(sizeof(struct ext2_inode_cache_ent) 90 * fs->icache->cache_size, 91 &fs->icache->cache); 92 if (retval) { 93 ext2fs_free_mem(&fs->icache->buffer); 94 ext2fs_free_mem(&fs->icache); 95 return retval; 96 } 97 ext2fs_flush_icache(fs); 98 return 0; 99} 100 101errcode_t ext2fs_open_inode_scan(ext2_filsys fs, int buffer_blocks, 102 ext2_inode_scan *ret_scan) 103{ 104 ext2_inode_scan scan; 105 errcode_t retval; 106 errcode_t (*save_get_blocks)(ext2_filsys f, ext2_ino_t ino, blk_t *blocks); 107 108 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 109 110 /* 111 * If fs->badblocks isn't set, then set it --- since the inode 112 * scanning functions require it. 113 */ 114 if (fs->badblocks == 0) { 115 /* 116 * Temporarly save fs->get_blocks and set it to zero, 117 * for compatibility with old e2fsck's. 118 */ 119 save_get_blocks = fs->get_blocks; 120 fs->get_blocks = 0; 121 retval = ext2fs_read_bb_inode(fs, &fs->badblocks); 122 if (retval && fs->badblocks) { 123 ext2fs_badblocks_list_free(fs->badblocks); 124 fs->badblocks = 0; 125 } 126 fs->get_blocks = save_get_blocks; 127 } 128 129 retval = ext2fs_get_mem(sizeof(struct ext2_struct_inode_scan), &scan); 130 if (retval) 131 return retval; 132 memset(scan, 0, sizeof(struct ext2_struct_inode_scan)); 133 134 scan->magic = EXT2_ET_MAGIC_INODE_SCAN; 135 scan->fs = fs; 136 scan->inode_size = EXT2_INODE_SIZE(fs->super); 137 scan->bytes_left = 0; 138 scan->current_group = 0; 139 scan->groups_left = fs->group_desc_count - 1; 140 scan->inode_buffer_blocks = buffer_blocks ? buffer_blocks : 8; 141 scan->current_block = scan->fs-> 142 group_desc[scan->current_group].bg_inode_table; 143 scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super); 144 scan->blocks_left = scan->fs->inode_blocks_per_group; 145 retval = ext2fs_get_mem((size_t) (scan->inode_buffer_blocks * 146 fs->blocksize), 147 &scan->inode_buffer); 148 scan->done_group = 0; 149 scan->done_group_data = 0; 150 scan->bad_block_ptr = 0; 151 if (retval) { 152 ext2fs_free_mem(&scan); 153 return retval; 154 } 155 retval = ext2fs_get_mem(scan->inode_size, &scan->temp_buffer); 156 if (retval) { 157 ext2fs_free_mem(&scan->inode_buffer); 158 ext2fs_free_mem(&scan); 159 return retval; 160 } 161 if (scan->fs->badblocks && scan->fs->badblocks->num) 162 scan->scan_flags |= EXT2_SF_CHK_BADBLOCKS; 163 *ret_scan = scan; 164 return 0; 165} 166 167void ext2fs_close_inode_scan(ext2_inode_scan scan) 168{ 169 if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) 170 return; 171 172 ext2fs_free_mem(&scan->inode_buffer); 173 scan->inode_buffer = NULL; 174 ext2fs_free_mem(&scan->temp_buffer); 175 scan->temp_buffer = NULL; 176 ext2fs_free_mem(&scan); 177 return; 178} 179 180void ext2fs_set_inode_callback(ext2_inode_scan scan, 181 errcode_t (*done_group)(ext2_filsys fs, 182 ext2_inode_scan scan, 183 dgrp_t group, 184 void * priv_data), 185 void *done_group_data) 186{ 187 if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) 188 return; 189 190 scan->done_group = done_group; 191 scan->done_group_data = done_group_data; 192} 193 194int ext2fs_inode_scan_flags(ext2_inode_scan scan, int set_flags, 195 int clear_flags) 196{ 197 int old_flags; 198 199 if (!scan || (scan->magic != EXT2_ET_MAGIC_INODE_SCAN)) 200 return 0; 201 202 old_flags = scan->scan_flags; 203 scan->scan_flags &= ~clear_flags; 204 scan->scan_flags |= set_flags; 205 return old_flags; 206} 207 208/* 209 * This function is called by ext2fs_get_next_inode when it needs to 210 * get ready to read in a new blockgroup. 211 */ 212static errcode_t get_next_blockgroup(ext2_inode_scan scan) 213{ 214 scan->current_group++; 215 scan->groups_left--; 216 217 scan->current_block = scan->fs-> 218 group_desc[scan->current_group].bg_inode_table; 219 220 scan->current_inode = scan->current_group * 221 EXT2_INODES_PER_GROUP(scan->fs->super); 222 223 scan->bytes_left = 0; 224 scan->inodes_left = EXT2_INODES_PER_GROUP(scan->fs->super); 225 scan->blocks_left = scan->fs->inode_blocks_per_group; 226 return 0; 227} 228 229errcode_t ext2fs_inode_scan_goto_blockgroup(ext2_inode_scan scan, 230 int group) 231{ 232 scan->current_group = group - 1; 233 scan->groups_left = scan->fs->group_desc_count - group; 234 return get_next_blockgroup(scan); 235} 236 237/* 238 * This function is called by get_next_blocks() to check for bad 239 * blocks in the inode table. 240 * 241 * This function assumes that badblocks_list->list is sorted in 242 * increasing order. 243 */ 244static errcode_t check_for_inode_bad_blocks(ext2_inode_scan scan, 245 blk_t *num_blocks) 246{ 247 blk_t blk = scan->current_block; 248 badblocks_list bb = scan->fs->badblocks; 249 250 /* 251 * If the inode table is missing, then obviously there are no 252 * bad blocks. :-) 253 */ 254 if (blk == 0) 255 return 0; 256 257 /* 258 * If the current block is greater than the bad block listed 259 * in the bad block list, then advance the pointer until this 260 * is no longer the case. If we run out of bad blocks, then 261 * we don't need to do any more checking! 262 */ 263 while (blk > bb->list[scan->bad_block_ptr]) { 264 if (++scan->bad_block_ptr >= bb->num) { 265 scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; 266 return 0; 267 } 268 } 269 270 /* 271 * If the current block is equal to the bad block listed in 272 * the bad block list, then handle that one block specially. 273 * (We could try to handle runs of bad blocks, but that 274 * only increases CPU efficiency by a small amount, at the 275 * expense of a huge expense of code complexity, and for an 276 * uncommon case at that.) 277 */ 278 if (blk == bb->list[scan->bad_block_ptr]) { 279 scan->scan_flags |= EXT2_SF_BAD_INODE_BLK; 280 *num_blocks = 1; 281 if (++scan->bad_block_ptr >= bb->num) 282 scan->scan_flags &= ~EXT2_SF_CHK_BADBLOCKS; 283 return 0; 284 } 285 286 /* 287 * If there is a bad block in the range that we're about to 288 * read in, adjust the number of blocks to read so that we we 289 * don't read in the bad block. (Then the next block to read 290 * will be the bad block, which is handled in the above case.) 291 */ 292 if ((blk + *num_blocks) > bb->list[scan->bad_block_ptr]) 293 *num_blocks = (int) (bb->list[scan->bad_block_ptr] - blk); 294 295 return 0; 296} 297 298/* 299 * This function is called by ext2fs_get_next_inode when it needs to 300 * read in more blocks from the current blockgroup's inode table. 301 */ 302static errcode_t get_next_blocks(ext2_inode_scan scan) 303{ 304 blk_t num_blocks; 305 errcode_t retval; 306 307 /* 308 * Figure out how many blocks to read; we read at most 309 * inode_buffer_blocks, and perhaps less if there aren't that 310 * many blocks left to read. 311 */ 312 num_blocks = scan->inode_buffer_blocks; 313 if (num_blocks > scan->blocks_left) 314 num_blocks = scan->blocks_left; 315 316 /* 317 * If the past block "read" was a bad block, then mark the 318 * left-over extra bytes as also being bad. 319 */ 320 if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) { 321 if (scan->bytes_left) 322 scan->scan_flags |= EXT2_SF_BAD_EXTRA_BYTES; 323 scan->scan_flags &= ~EXT2_SF_BAD_INODE_BLK; 324 } 325 326 /* 327 * Do inode bad block processing, if necessary. 328 */ 329 if (scan->scan_flags & EXT2_SF_CHK_BADBLOCKS) { 330 retval = check_for_inode_bad_blocks(scan, &num_blocks); 331 if (retval) 332 return retval; 333 } 334 335 if ((scan->scan_flags & EXT2_SF_BAD_INODE_BLK) || 336 (scan->current_block == 0)) { 337 memset(scan->inode_buffer, 0, 338 (size_t) num_blocks * scan->fs->blocksize); 339 } else { 340 retval = io_channel_read_blk(scan->fs->io, 341 scan->current_block, 342 (int) num_blocks, 343 scan->inode_buffer); 344 if (retval) 345 return EXT2_ET_NEXT_INODE_READ; 346 } 347 scan->ptr = scan->inode_buffer; 348 scan->bytes_left = num_blocks * scan->fs->blocksize; 349 350 scan->blocks_left -= num_blocks; 351 if (scan->current_block) 352 scan->current_block += num_blocks; 353 return 0; 354} 355 356#if 0 357/* 358 * Returns 1 if the entire inode_buffer has a non-zero size and 359 * contains all zeros. (Not just deleted inodes, since that means 360 * that part of the inode table was used at one point; we want all 361 * zeros, which means that the inode table is pristine.) 362 */ 363static inline int is_empty_scan(ext2_inode_scan scan) 364{ 365 int i; 366 367 if (scan->bytes_left == 0) 368 return 0; 369 370 for (i=0; i < scan->bytes_left; i++) 371 if (scan->ptr[i]) 372 return 0; 373 return 1; 374} 375#endif 376 377errcode_t ext2fs_get_next_inode(ext2_inode_scan scan, ext2_ino_t *ino, 378 struct ext2_inode *inode) 379{ 380 errcode_t retval; 381 int extra_bytes = 0; 382 383 EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN); 384 385 /* 386 * Do we need to start reading a new block group? 387 */ 388 if (scan->inodes_left <= 0) { 389 force_new_group: 390 if (scan->done_group) { 391 retval = (scan->done_group) 392 (scan->fs, scan, scan->current_group, 393 scan->done_group_data); 394 if (retval) 395 return retval; 396 } 397 if (scan->groups_left <= 0) { 398 *ino = 0; 399 return 0; 400 } 401 retval = get_next_blockgroup(scan); 402 if (retval) 403 return retval; 404 } 405 /* 406 * This is done outside the above if statement so that the 407 * check can be done for block group #0. 408 */ 409 if (scan->current_block == 0) { 410 if (scan->scan_flags & EXT2_SF_SKIP_MISSING_ITABLE) { 411 goto force_new_group; 412 } else 413 return EXT2_ET_MISSING_INODE_TABLE; 414 } 415 416 417 /* 418 * Have we run out of space in the inode buffer? If so, we 419 * need to read in more blocks. 420 */ 421 if (scan->bytes_left < scan->inode_size) { 422 memcpy(scan->temp_buffer, scan->ptr, scan->bytes_left); 423 extra_bytes = scan->bytes_left; 424 425 retval = get_next_blocks(scan); 426 if (retval) 427 return retval; 428#if 0 429 /* 430 * XXX test Need check for used inode somehow. 431 * (Note: this is hard.) 432 */ 433 if (is_empty_scan(scan)) 434 goto force_new_group; 435#endif 436 } 437 438 retval = 0; 439 if (extra_bytes) { 440 memcpy(scan->temp_buffer+extra_bytes, scan->ptr, 441 scan->inode_size - extra_bytes); 442 scan->ptr += scan->inode_size - extra_bytes; 443 scan->bytes_left -= scan->inode_size - extra_bytes; 444 445#ifdef EXT2FS_ENABLE_SWAPFS 446 if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) || 447 (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) 448 ext2fs_swap_inode(scan->fs, inode, 449 (struct ext2_inode *) scan->temp_buffer, 0); 450 else 451#endif 452 *inode = *((struct ext2_inode *) scan->temp_buffer); 453 if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES) 454 retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; 455 scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES; 456 } else { 457#ifdef EXT2FS_ENABLE_SWAPFS 458 if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) || 459 (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) 460 ext2fs_swap_inode(scan->fs, inode, 461 (struct ext2_inode *) scan->ptr, 0); 462 else 463#endif 464 *inode = *((struct ext2_inode *) scan->ptr); 465 scan->ptr += scan->inode_size; 466 scan->bytes_left -= scan->inode_size; 467 if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK) 468 retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; 469 } 470 471 scan->inodes_left--; 472 scan->current_inode++; 473 *ino = scan->current_inode; 474 return retval; 475} 476 477/* 478 * Functions to read and write a single inode. 479 */ 480errcode_t ext2fs_read_inode (ext2_filsys fs, ext2_ino_t ino, 481 struct ext2_inode * inode) 482{ 483 unsigned long group, block, block_nr, offset; 484 char *ptr; 485 errcode_t retval; 486 int clen, length, i, inodes_per_block; 487 488 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 489 490 /* Check to see if user has an override function */ 491 if (fs->read_inode) { 492 retval = (fs->read_inode)(fs, ino, inode); 493 if (retval != EXT2_ET_CALLBACK_NOTHANDLED) 494 return retval; 495 } 496 /* Create inode cache if not present */ 497 if (!fs->icache) { 498 retval = create_icache(fs); 499 if (retval) 500 return retval; 501 } 502 /* Check to see if it's in the inode cache */ 503 for (i=0; i < fs->icache->cache_size; i++) { 504 if (fs->icache->cache[i].ino == ino) { 505 *inode = fs->icache->cache[i].inode; 506 return 0; 507 } 508 } 509 if ((ino == 0) || (ino > fs->super->s_inodes_count)) 510 return EXT2_ET_BAD_INODE_NUM; 511 if (fs->flags & EXT2_FLAG_IMAGE_FILE) { 512 inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super); 513 block_nr = fs->image_header->offset_inode / fs->blocksize; 514 block_nr += (ino - 1) / inodes_per_block; 515 offset = ((ino - 1) % inodes_per_block) * 516 EXT2_INODE_SIZE(fs->super); 517 } else { 518 group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); 519 offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * 520 EXT2_INODE_SIZE(fs->super); 521 block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); 522 if (!fs->group_desc[(unsigned)group].bg_inode_table) 523 return EXT2_ET_MISSING_INODE_TABLE; 524 block_nr = fs->group_desc[(unsigned)group].bg_inode_table + 525 block; 526 } 527 if (block_nr != fs->icache->buffer_blk) { 528 retval = io_channel_read_blk(fs->io, block_nr, 1, 529 fs->icache->buffer); 530 if (retval) 531 return retval; 532 fs->icache->buffer_blk = block_nr; 533 } 534 offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); 535 ptr = ((char *) fs->icache->buffer) + (unsigned) offset; 536 537 memset(inode, 0, sizeof(struct ext2_inode)); 538 length = EXT2_INODE_SIZE(fs->super); 539 if (length > sizeof(struct ext2_inode)) 540 length = sizeof(struct ext2_inode); 541 542 if ((offset + length) > EXT2_BLOCK_SIZE(fs->super)) { 543 clen = (int) (EXT2_BLOCK_SIZE(fs->super) - offset); 544 memcpy((char *) inode, ptr, clen); 545 length -= clen; 546 547 retval = io_channel_read_blk(fs->io, block_nr+1, 1, 548 fs->icache->buffer); 549 if (retval) { 550 fs->icache->buffer_blk = 0; 551 return retval; 552 } 553 fs->icache->buffer_blk = block_nr+1; 554 555 memcpy(((char *) inode) + clen, 556 fs->icache->buffer, length); 557 } else 558 memcpy((char *) inode, ptr, length); 559 560#ifdef EXT2FS_ENABLE_SWAPFS 561 if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || 562 (fs->flags & EXT2_FLAG_SWAP_BYTES_READ)) 563 ext2fs_swap_inode(fs, inode, inode, 0); 564#endif 565 566 /* Update the inode cache */ 567 fs->icache->cache_last = (fs->icache->cache_last + 1) % 568 fs->icache->cache_size; 569 fs->icache->cache[fs->icache->cache_last].ino = ino; 570 fs->icache->cache[fs->icache->cache_last].inode = *inode; 571 572 return 0; 573} 574 575errcode_t ext2fs_write_inode(ext2_filsys fs, ext2_ino_t ino, 576 struct ext2_inode * inode) 577{ 578 unsigned long group, block, block_nr, offset; 579 errcode_t retval; 580 struct ext2_inode temp_inode; 581 char *ptr; 582 int clen, length, i; 583 584 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 585 586 /* Check to see if user provided an override function */ 587 if (fs->write_inode) { 588 retval = (fs->write_inode)(fs, ino, inode); 589 if (retval != EXT2_ET_CALLBACK_NOTHANDLED) 590 return retval; 591 } 592 593 /* Check to see if the inode cache needs to be updated */ 594 if (fs->icache) { 595 for (i=0; i < fs->icache->cache_size; i++) { 596 if (fs->icache->cache[i].ino == ino) { 597 fs->icache->cache[i].inode = *inode; 598 break; 599 } 600 } 601 } else { 602 retval = create_icache(fs); 603 if (retval) 604 return retval; 605 } 606 607 if (!(fs->flags & EXT2_FLAG_RW)) 608 return EXT2_ET_RO_FILSYS; 609 610 if ((ino == 0) || (ino > fs->super->s_inodes_count)) 611 return EXT2_ET_BAD_INODE_NUM; 612 613#ifdef EXT2FS_ENABLE_SWAPFS 614 if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || 615 (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) 616 ext2fs_swap_inode(fs, &temp_inode, inode, 1); 617 else 618#endif 619 memcpy(&temp_inode, inode, sizeof(struct ext2_inode)); 620 621 group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); 622 offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) * 623 EXT2_INODE_SIZE(fs->super); 624 block = offset >> EXT2_BLOCK_SIZE_BITS(fs->super); 625 if (!fs->group_desc[(unsigned) group].bg_inode_table) 626 return EXT2_ET_MISSING_INODE_TABLE; 627 block_nr = fs->group_desc[(unsigned) group].bg_inode_table + block; 628 offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); 629 ptr = (char *) fs->icache->buffer + (unsigned) offset; 630 631 length = EXT2_INODE_SIZE(fs->super); 632 clen = length; 633 if (length > sizeof(struct ext2_inode)) 634 length = sizeof(struct ext2_inode); 635 636 if (fs->icache->buffer_blk != block_nr) { 637 retval = io_channel_read_blk(fs->io, block_nr, 1, 638 fs->icache->buffer); 639 if (retval) 640 return retval; 641 fs->icache->buffer_blk = block_nr; 642 } 643 644 if ((offset + length) > EXT2_BLOCK_SIZE(fs->super)) { 645 clen = (int) (EXT2_BLOCK_SIZE(fs->super) - offset); 646 length -= clen; 647 } else { 648 length = 0; 649 } 650 memcpy(ptr, &temp_inode, clen); 651 retval = io_channel_write_blk(fs->io, block_nr, 1, fs->icache->buffer); 652 if (retval) 653 return retval; 654 655 if (length) { 656 retval = io_channel_read_blk(fs->io, ++block_nr, 1, 657 fs->icache->buffer); 658 if (retval) { 659 fs->icache->buffer_blk = 0; 660 return retval; 661 } 662 fs->icache->buffer_blk = block_nr; 663 memcpy(fs->icache->buffer, ((char *) &temp_inode) + clen, 664 length); 665 666 retval = io_channel_write_blk(fs->io, block_nr, 1, 667 fs->icache->buffer); 668 if (retval) 669 return retval; 670 } 671 672 fs->flags |= EXT2_FLAG_CHANGED; 673 return 0; 674} 675 676errcode_t ext2fs_get_blocks(ext2_filsys fs, ext2_ino_t ino, blk_t *blocks) 677{ 678 struct ext2_inode inode; 679 int i; 680 errcode_t retval; 681 682 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 683 684 if (ino > fs->super->s_inodes_count) 685 return EXT2_ET_BAD_INODE_NUM; 686 687 if (fs->get_blocks) { 688 if (!(*fs->get_blocks)(fs, ino, blocks)) 689 return 0; 690 } 691 retval = ext2fs_read_inode(fs, ino, &inode); 692 if (retval) 693 return retval; 694 for (i=0; i < EXT2_N_BLOCKS; i++) 695 blocks[i] = inode.i_block[i]; 696 return 0; 697} 698 699errcode_t ext2fs_check_directory(ext2_filsys fs, ext2_ino_t ino) 700{ 701 struct ext2_inode inode; 702 errcode_t retval; 703 704 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 705 706 if (ino > fs->super->s_inodes_count) 707 return EXT2_ET_BAD_INODE_NUM; 708 709 if (fs->check_directory) { 710 retval = (fs->check_directory)(fs, ino); 711 if (retval != EXT2_ET_CALLBACK_NOTHANDLED) 712 return retval; 713 } 714 retval = ext2fs_read_inode(fs, ino, &inode); 715 if (retval) 716 return retval; 717 if (!LINUX_S_ISDIR(inode.i_mode)) 718 return EXT2_ET_NO_DIRECTORY; 719 return 0; 720} 721 722